Your body will continue to produce milk for awhile after you stop breastfeeding. If, or I should say when, it begins to feel painful, you should pump, or manually manipulate, your breasts to excrete just enough milk to ease the pain. Usually you will stop prodicing milk in about a week or so.
Women often continue to lactate well after they've stopped breastfeeding. If you are producing a lot of milk, wearing tight fitting clothing around your chest can help.
The best thing to do is to wean your baby gradually, decreasing the amount of milk over a number of weeks. If that is not possible, there is not a whole lot you can do to make yourself dry up faster. Drinking sage tea can help a little, and some people suggest wearing green cabbage leaves in your bra.